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Finding the Fourth Proportional to 763.59, 1,145.28 and 215.76

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Solution

The fourth proportional to 763.59, 1,145.28 and 215.76 is: 323.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    763.59 : 1,145.28 = 215.76 : x
  2. Step 2: Convert to fraction form
    763.59/1,145.28 = 215.76/x
  3. Step 3: Cross multiply
    763.59x = 1,145.28 × 215.76
  4. Step 4: Simplify right side
    763.59x = 247,105.61
  5. Step 5: Solve for x
    x = 247,105.61/763.59
  6. Step 6: Final answer
    x = 323.61

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.